Direct (nonstop) flights from Chicago to Ontario
1 airline flys nonstop from Chicago O Hare International (ORD) to Ontario International Airport (ONT). It's 1,699 miles (2,735 km), about 4h 26m in the air. Operated by United Airlines.
United Airlines
Route data last updated: May 27, 2026
Airlines with non-stop flights
UA
United Airlines
Alternative Routes
Other ways to fly from Chicago to Ontario with one stop · direct emits 287 kg CO₂ per passenger
Looking for the return flight?
ONT → ORD: Flights from Ontario to ChicagoOther direct flights from Chicago
Direct flights from Ontario (ONT)
Frequently Asked Questions
How long is the direct flight from Chicago to Ontario?
A nonstop flight from Chicago (ORD) to Ontario (ONT) takes approximately 4 hours and 26 minutes. The distance is 1,699 miles (2,735 km).
Which airlines fly nonstop from Chicago to Ontario?
Just United Airlines.
Is there a nonstop flight from Chicago to Ontario?
Yes. 1 airline: United Airlines.
How far is Chicago from Ontario?
The flight distance from Chicago to Ontario is 1,699 miles (2,735 km), measured as the great-circle (shortest air) distance.
What type of aircraft flies from Chicago to Ontario?
At 4h 26m, this route typically uses narrow-body or mid-range jets — Boeing 737 MAX or Airbus A320neo. Varies by airline.
What is the carbon footprint of a flight from Chicago to Ontario?
Roughly 287 kg CO2 per passenger one-way. That's about the same as driving 1,435 km.
Is the return flight from Ontario to Chicago also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Chicago to Ontario?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Chicago O Hare International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.